The race they targeted was an international sporting event with athletes from 97 countries. There was ZERO expectation that victims would only be US citizens, and every expectation that there would be foreigners in the crowd.

They did not care who they blew up. It makes no sense at all that they would suddenly care who they shot.

Looks like someone has never been to a marathon before. Yes, it is an international event, but it is so overwhelmingly (white) American it is not even funny. Besides, by the time of the explosions the Kenyans were probably done with the marathon by two hours.

My default is to believe this story until it is proven otherwise. ]I doubt I can disabuse you of that notion so I won't try.